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L. H. SPARKS. BOILER.

No. 545,386. Patented Aug. 27, 1895..

Q q l UNITED STATES PATENT Option.

LORENZO H. SPARKS, OF \VARREN, OHIO, ASSIGNOR OF ONE-HALF TO ELMER U. SPARKS, OF'SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 545,386, dated August 2'7, 1895.

Application filed April 20, 1893. Serial No. 471d 24. (No model.)

To all whom it may concern.-

Be it known that I, LORENZO H. SPARKS, of Warren, in the county of Trumbull and State of Ohio, have invented certain new and useful Improvements in Boilers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention contemplates certain new and useful improvements in boilers, and has for its object the production of a new and improved form of boiler, by means of which the maximum heating capacity of the fuel is utilized and the water is readily and easily heated to a high degree of temperature.

The invention comprises the novel features of construction, and also the combination and arrangement of parts, substantially as hereinafter fully set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a vertical sectional View of my improved boiler. Fig. 2 is a horizontal sectional view on the line a: :1), Fig. 1.

Referring to the drawings, A designates the outer casing of cylindrical form, narrowed above the fire-box; a, the ash-pit; a, the horizontally-disposed grate, and a a series of six (more or less) doors opening above said grate in the lower cylindrical portion of the casing.

13 is a water-jacket formed by an inner wall 1), parallel with the casing A, from a point just beneath grate a to beyond the horizontal center of the upper narrowed portion Z). Through the inclined portion 11 of the boiler are preferably passed hollow staybolts 6 for increasing the draft in the combustion-chamber.

O is a water-cylinder extending vertically through the boiler or furnace and through a central circular opening in grate d. To its lower end is secured a drum D, designed to receive mud and the like deposited from the water contained in the cylinder. To the upper end of the latter is connected a drum cl, forming a steanrdome. This dome is located near the smoke-outlet pipe 61', which extends from the contracted top of easing A. From cylinder 0, just beneath the grate, extend curved branch tubesd which open at their outer ends into water-jacket B. Thus communication is established between the latter and said cylinder. From the upper end of the Water-jacket open tubes E, which are curved inward, and all of said tubes open into the central cylinder, thus establishing an upper communication.

F designates series of tubes, arranged in fixed relation to each other and opening at their ends into the cylinder 0, they being located in the uppercontracted portion and on the line of travel of the products of combustion. These tubes open into the cylinder at their upper ends just beneath the tubes E, and after being curved outward they are carried downward in parallel planes to a point near the widened portion of the water-jacket and then curved inward and secured to the cylinder into which they open. Hence all of these tubes are on the line of passage of the products of combustion, and the water contained in them is thoroughly and quickly heated. ater may be introd need and steam carried oil by any suitable means-as, for instance, pipes W and S, as shown in Fig. 1.

By means of the construction above described a complete and thorough circulation is maintained, and there isa continuous communication between all of the water-containing parts of the boiler. The arrangement is such that none of the parts interfere with access being had with every point of the fire in the combustion-chamber, and by connectin g the central cylinder with the water-jacket by tubes extending beneath the fire-grate the full heating capacity of the fire on the grate is utilized.

I claim as my invention- 1. The herein-described boiler, comprising the casing, the inner wall concentric with said casing forming a water jacket, said casing and inner wall having upper and lower cylindrical portions, and an inclined portion, hollow rivets extending through said casing and 5 wall in the said inclined portion, the grate above the lower end of said inner wall, the central cylinder having drums at its ends, the series of tubes opening at their ends into said cylinder, the series of tubes extending from the upper ends of said water-jacket and opening into said cylinder, and the series of hori- TOO said cylinder and located between the latter and the water jacket, and the upper and lower drums communicating with said cylinder and located respectively above and below the points of connection of said latter tubes with said cylinder, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

LORENZO I-I. SPARKS.

Witnesses:

ALLISON D. TRUSSELL, J. R. LACHMAN. 

